Insecticides

ABSTRACT

A pesticidal composition comprising 4-phenoxyphenyl 2-(2-pyridyloxy) propyl ether and 2 -tert-butyl-5-(4-tert-butylbenzylthio) 4-chloropyridazin-3(2H)-one as active ingredients, and a method for controlling pests using 4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether and 2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one.

TECHNICAL FIELD

The present invention relates to pesticidal composition.

BACKGROUND ARTS

It is known that 4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether has apesticidal activity in U.S. Pat. No. 4,751,225. It is also known that2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one hasa pesticidal activity in U.S. Pat. No. 4,877,787.

However, the pesticidal activities of these compounds may beunsatisfactory in some cases and it is desired to be developed moreexcellent pesticidal composition.

DISCLOSURE OF THE INVENTION

According to the present invention, a pesticidal composition comprising4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether given by formula (1):

and 2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-onegiven by formula (2):

as active ingredients can be used for controlling pests which aredifficult to control satisfactorily by each of the above compoundssolely. Further, the pesticidal composition gives a synergistic actionand the application dosages of these compounds can be decreased.

Namely, the present invention provides a pesticidal compositioncomprising 4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether given by formula(1) (hereinafter, referred to as Compound A) and2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-onegiven by formula (2) (hereinafter, referred to as Compound B) as activeingredients and a pesticidal method comprising applying an effectiveamount of 4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether and2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one topests or a place where the pests inhabit.

Compound A comprised in the pesticidal composition of the presentinvention can be manufactured according to the description of U.S. Pat.No. 4,751,225 and it is also available in the market. Compound B can bemanufactured according to the description of U.S. Pat. No. 4,877,787 andit is also available in the market.

Examples of the pest controlled by the pesticidal composition of thepresent invention include the following arthropods such as insects andacarina and nematoda:

-   Hemipteran pests such as Delphacidae (planthoppers) [e.g. Laodelphax    striatellus (small brown planthopper), Nilaparvata lugens (brown    planthopper) and Sogatella furcifera (white-backed rice    planthopper)], Deltocephalidae (leafhoppers) [e.g. Nephotettix    cincticeps and Nephotettix virescens], Aphididae (aphids) [e.g.    Aphis gossypii (cotton aphids), Myzus persicae (green peach aphid),    Aphis citricola, Lipaphis pserudobrassicae (turnip aphid),    Nippolachnus piri, Toxoptera aurantii (black citrus apid) and    Toxoptera ciidius (brown citrus apid)], stink bugs [e.g. Nezara    antennata (green stink bug), Cletus punctiger, Riptortus clavetus    (bean bug) and Plautia stali (oriental stink bug)], Aleyrodidae    (whiteflies) [e.g. Trialeurodes vaporariorum (greenhouse whitefly),    Bemisia tabaci (sweetpotato whitefly) and Bemisia argentifolli    (silverleaf whitefly)], scales [e.g. Aonidiella aurantii (California    red scale), Comstockaspis perniciosa (San Jose scale), Unaspis citri    (citrus snow scale), Pseudaulacaspis pentagona (white peach scale),    Saissetia oleae (brown olive scale), Lepidosaphes beekii (purple    scale), Ceroplastes rubens (red wax scale) and Icerya purchasi    (cottonycushion scale)], Tingidae (lace bugs) and Psyllidae    (suckers);-   Lepidopteran pests such as Pyralidae [e.g. Chilo suppressalis (rice    stem borer), Cnaphalocrocis medinalis (rice leafroller), Ostrinia    nubilalis (European cornborer), Parapediasia teterrella (bluegrass    webworm), Notarcha derogata (cotton leafroller) and Plodia    interpunctella (Indian meal moth)], Noctuidae [e.g. Spodoptera    litura (tobacco cutworm), Pseudaletia separata (rice armyworm),    Mamestra brassicae (cabbage armyworm), Agrotis ipsilon (black    cutworm), Trichoplusia spp., Heliothis spp. and Helicoverpa spp.],    Pieridae [e.g. Pieris rapae], Tortricidae [e.g. Adoxophyes spp.,    Grapholita molesta (oriental fruit moth) and Cydia pomonella],    Carposinidae [e.g. Carposina niponensis (peach fruit moth)],    Lyonetiidae [e.g. Lyonetia spp.], Lymantriidae [e.g. Lymantria spp.    and Euproctis spp.], Yponameutidae [e.g. Plutella xylostella],    Gelechiidae [e.g. Pectinophora gossypiella (pink bollworm)],    Arctiidae (tiger moths) [e.g. Hyphantria cunea (fall webworm)] and    Tineidae [e.g. Tinea translucens (casemaking clothes moth) and    Tineola bisselliella (webbing clothes moth)]; Dipteran pests such as    Culex spp. [e.g. Culex pipiens pallens and Culex tritaeniorhynchus],    Aedes spp. [e.g. Aedes aegypti and Aedes albopictus], Anopheles spp.    [e.g. Anopheles sinensis], Chironomidae (midges), Muscidae [e.g.    Musca domestica (housefly), Muscina stabulans (false housefly) and    Fannia spp. (little house flies)], Calliphoridae, Sarcophagidae,    Anthomyiidae [e.g. Delia platura (seedcorn maggot) and Delia antiqua    (onion maggot)], Tephritidae (fruit flies), Drosophilidae (vinegar    flies), Psychodidae (sand flies), Simuliidae (black flies),    Tabanidae, Stomoxyidae (stable flies) and Agromyzidae (leafininer    flies);-   Coleopteran pests such as corn rootworms [e.g. Diabrotica virgifera    virgifera (western corn rootworm) and Diabrotica undecimpunctata    howardi (southern corn rootworm)], Scarabaeidae [e.g. Anomala cuprea    and Anomala rufocuprea], Curculionidae (weevils) [e.g. Sitophilus    zeamais (maize weevil), Lissorhoptrus oryzophilus (ricewater    weevil), Hypera pastica (alfalfa weevil) and Callosobruchuys    chienensis (adzuki bean weevil)], Tenebrionidae (darkling beetles)    [e.g. Tenebrio molitor (yellow mealworm) and Tribolium castaneum    (red flour beetle)], Chrysomelidae (leaf beetles) [e.g. Aulacophora    femoralis (cucurbit leaf beetle), Phyllotreta striolata (striped    flea beetle) and Leptinotarsa decemlineata (Colorado beetle)],    Anobiidae, Epilachna spp. [e.g. Epilachna vigintioctopunctata],    Lyctidae (powderpost beetles), Bostrychidae, Cerambycidae and    Paederus fuscipes;-   Dictyopteran pests such as Blattella germanica (German cockroach),    Periplaneta fuliginosa (smokybrown cockroach), Periplaneta americana    (American cockroach), Periplaneta brunnea (brown cockroach) and    Blatta orientalis;-   Thysanopteran pests such as Thrips palmi, Thrips tabaci, Thrips    hawaiiensis (flower thrips), Scirtothrips dorsalis (yellow tea    thrips), Frankliniella intonsa (flower thrips), Frankliniella    occidentalis (western flower thrips) and Ponticulothrips diospyrosi;-   Hymenopteran pests such as Formicidae (ants), Vespidae (hornets),    Bethylidae and Tenthredinidae (sawflies) [e.g. Athalia japonica    (cabbage sawfly)];-   Orthopteran pests such as Gryllotalpidae (mole crickets) and    Acrididae (grasshoppers);-   Siphonapteran pests such as Ctenocephalides felis (cat flea),    Ctenocephalides canis (dog flea) and Pulex irritans (human flea);-   Anopluran pests such as Pediculus humanus corporis and Phthirus    pubis (crab louse);-   Isopteran pests such as Reticulitermes speratus and Coptotermes    formosanus;-   Acarina such as Tetranychidae (spider mites) [e.g. Tetranychus    urticae (two-spotted spider mite), Tetranychus kanzawai (Kanzawa    spider mite), Panonychus citri (citrus red mite), Panonychus ulmi    (European red mite) and Oligonychus spp.], Eriophyidae [e.g. Aculops    pelekassi (pink citrus rust mite) and Calacarus carinatus (purple    tea mite)], Tarsonemidae [e.g. Polyphagotarsonemus latus],    Tenuipalpidae (false spider mites), Tuckerellidae, Ixodidae [e.g.    Haemaphysalis japonica (Japanese tick), Haemaphysalis flava (yellow    tick), Haemaphysalis longicornis, Boophils microplus, Ixodes ovatus    and Ixodes persulcatus], Acaridae [e.g. Tyrophagus putrescentiae    (copra mite)], Dermanyssidae [e.g. Dermatophagoides farinae    (American house dust mite), Dermatophagoides ptrenyssnus],    Cheyletidae [e.g. Cheyletus eruditus, Cheyletus fortis, Cheyletus    malaccensi and Cheyletus moorei] and chicken mites]; and-   Nematoda such as Pratylenchus coffeae (coffee root-lesion nematode),    Pratylenchus fallax, Pratylenchus loosi, Pratylenchus vulnus (walnut    root-lesion nematode), Heterodera glycines (soybean cyst nematode),    Globodera rostochiensis (potato cyst nematode), Meloidogyne hapla    (northern root-knot nematode) and Meloidogyne incognita (southern    root-knot nematode).

In the pesticidal composition of the present invention, the mixing ratioof Compound A to Compound B is usually 30:1 to 1:50, preferably 5:1 to1:5, more preferably 4:1 to 1:2 by weight.

The pesticidal composition of the present invention may be a mixture ofCompound A with Compound B as it is, but usually further comprises asolid carrier, liquid carrier, gaseous carrier and/or bait (basematerial for poison bait), optionally surfactant and other auxiliariesto be formulated to oil solution, emulsifiable concentrates, flowable,granules, dusts, aerosol, fogging, smoking, poison bait, microcapsuleformulation, ULV formulation, spot-on formulation, pour-on formulation,shampoo formulation, sheet formulation and resin formulation.

These formulations usually contain 0.01 to 95% by weight for the totalamount of Compound A and Compound B.

Examples of the solid carrier used for the formulation include finepowders and granules of clays such as kaolin clay, diatomaceous earth,synthetic hydrated silica, bentonite, Fubasami clay and terra alba;talc; ceramics; the other inorganic minerals such as sericite, quartz,sulfur, activated carbon, calcium carbonate and hydrated silica; andchemical fertilizers such as ammonium sulfate, ammonium phosphate,ammonium nitrate, urea and ammonium chloride. Examples of the liquidcarriers include water; alcohols such as methanol and ethanol; ketonessuch as acetone and methyl ethyl ketone; aromatic hydrocarbons such asbenzene, toluene, xylene, ethylbenzene and methylnaphthalene; aliphatichydrocarbons such as hexane, cyclohexane, kerosene and gas oil; esterssuch as ethyl acetate and butyl acetate; nitriles such as acetonitrileand isobutyronitrile; ethers such as diisopropyl ether and dioxane; acidamides such as N,N-dimethylformamide and N,N-dimethylacetamide;halogenated hydrocarbons such as dichloromethane, trichloroethane andcarbon tetrachloride; dimethyl sulfoxide; and vegetable oils such assoybean oil and cottonseed oil.

Examples of the gaseous carrier include fluorocarbons, butane gas, LPG(liquefied petroleum gas), dimethyl ether and carbon dioxide.

Examples of the surfactant include alkyl sulfate ester salts,alkylsulfonate salts, alkylarylsulfonate salts, alkylaryl ethers andpolyoxyethylenated derivatives thereof, polyethyleneglycol ethers,polyvalent alcohol esters and sugar alcohol derivatives.

Examples of the other auxiliaries such as adhesive agents, dispersantsand stabilizers include casein; gelatin; saccharides such as starch, gumarabic, cellulose derivatives and alginic acid; lignin derivatives;bentonite; saccharides; synthetic water-soluble polymers such aspolyvinyl alcohol, polyvinylpyrrolidone and polyacrylic acids; PAP(isopropyl acid phosphate); BHT (2,6-di-tert-butyl-4-methylphenol); BHA(mixture of 2-tert-butyl-4-methoxyphenol and3-tert-butyl-4-methoxyphenol); vegetable oils; mineral oils; fatty acidsand fatty acid esters.

Examples of the base materials for the poison bait include baitingredients such as grain powders, vegetable oils, sugars andcrystalline cellulose; antioxidants such as dibutylhydroxytoluene andnordihydroguaiaretic acid; preservatives such as dehydroacetic acid;substances for preventing erroneous eating from children and pets suchas red pepper powder; and pest-attracting flavors such as cheese flavor,onion flavor and peanut oil.

The pesticidal composition of the present invention may be prepared bymixing a formulation of Compound A with a formulation of Compound B.Further, Compound A and Compound B can be mixed at the time ofapplication.

In the present pesticidal method, the pesticidal composition of thepresent invention is usually utilized, but it is possible to applyCompound A or its formulation and Compound B or its formulationsimultaneously without mixing in advance. At that time, the ratio ofCompound A to Compound B is usually 30:1 to 1:50, preferably 4:1 to 1:2by weight.

In case of controlling agricultural or forestry pests by the pesticidalcomposition of the present invention, the total application rate ofCompound A and Compound B is usually 1 to 10000 g per 1 hectare.Emulsifiable concentrates, wettable powders and flowables and the likeare usually diluted with water to make the concentration of the activeingredients 10 to 10000 ppm and applied. Granules, dusts and the likeare usually applied as they are. These formulations can be applieddirectly to plants which are crops to be protected from pests, orapplied to soil for controlling the pests inhabiting the soil. Further,sheet or string formulation of the present pesticidal composition can becoiled, set on the neighborhood of the plant or spread on the soilsurface near the plant.

In case of controlling hygienically unfavorable pests by the pesticidalcomposition of the present invention, emulsifiable concentrates,wettable powders and flowables and the like are usually diluted withwater to make the concentration of the active ingredients 0.01 to 10000ppm and applied. Oil solution, aerosol, smoking, poison bait and thelike are applied as they are.

The pesticidal composition of the present invention can be utilized forcontrolling ectoparasites of cattle such as oxen, sheep, goats andchickens and small animals such as dogs, cats, rats and mice. In thatcase, it can be applied to the animals by conventional veterinarymethods. Typical methods for systemic control are application of tablet,mixing with feed, administration of suppository or injection (e.g.,intramuscular, subcutaneous, intravenous, intraperitoneal). Non-systemiccontrol methods are, for example, spraying oil solution or aqueousliquid formulation, pour-on or spot-on treatment, washing animals withshampoo formulation, putting resin formulation such as collar or ear-tagto the animal. In case of the application to the animal body, the dosageof the total amount of Compound A and Compound B is usually in the rangeof 0.1 to 1000 mg per 1 kg of the animal weight.

The amounts or concentrations for application may vary depending upontype of formulations, timing, places and methods of application, kindsof pests, degree of damage, and other factors; they can therefore beincreased or decreased without limitation to the above ranges.

The pesticidal composition of the present invention can be used with theother insecticide, acaricide, nematocide, fungicide, herbicide, plantgrowth regulator, synergist, fertilizer, soil improving agent or animalfood.

Examples of the insecticide, acaricide and nematocide include pyrethroidcompounds such as permethrin, cypermethrin, fenvarelate, esfenvarelate,fenpropathrin, biphenthrin, deltamethrin, fluvalinate, flucythrinate,allethrin, d-allethrin, prallethrin, cyphenothrin, phenothrin,resmethrin, tefluthrin, empenthrin, acrinathrin, cyhalothrin,cyfluthrin, etofenprox, halfenprox, silafluofen, tralomethrin,cycloprothrin, esbiothrin, transfluthrin, terallethrin, imiprothrin and1-ethynyl-2-fluoro-2-pentenyl3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate;organophosphorus compounds such as cyanophos, fenthion, fenitrothion,parathion, methylparathion, pirimiphos-methyl, diazinon, isoxathion,pyridaphenthion, chlorpyrifos, chlorpyrifos-methyl, oxydeprofos,vamidothion, malathion, phenthoate, dimethoate, thiometon, disulfoton,phosalone, phosmet, methidathion, prothiofos, sulprofos, profenofos,azinphosmethyl, pyraclofos, salithion, tetrachlorvinphos, dichlorvos,monocrotophos, naled, dimethylvinphos, propaphos, acephate, metamidofosand ethion; carbamate compounds such as carbaryl, metolcarb, isoprocarb,fenobcarb, propoxur, XMC, ethiofencarb, bendiocarb, pyrimicarb,carbosulfan, carbofuran, benfuracarb, furathiocarb, methomyl,thiodicarb, oxamyl, alanycarb, metoxadiazone and fenothiocarb;neonicotinoids such as nitroiminoimidazolidine derivatives,nitrovinylidenediamine derivatives [e.g.N-[(6-chloro-3-pyridylmethyl)-N-ethyl-N′-methyl-2-nitrovinylidenediamine(common name: nitenpyram)], nitroguanidine derivatives, cyanoacetamidinederivatives [e.g.N¹-[(6-chloro-3-pyridyl)methyl]-N²-cyano-N¹-methylacetamidine (commonname: acetamiprid)], cyanoiminothiazolidine derivatives [e.g.1-(2-chloro-5-pyridylmethyl)-2-cyanoiminothiazolidine (common name:thiacloprid)], nitroiminotetrahydro-1,3,5-oxadiazine derivatives [e.g.3-[(2-chloro-5-thiazolyl)methyl]-5-methyl-4-nitroiminotetrahydro-1,3,5-oxadiazine(common name: thiamethoxam)], nitroiminohexahydro-1,3,5-triazinederivatives [e.g.3,5-dimethyl-1-[(2-chloro-5-thiazolyl)methyl]-2-nitroiminohexahydro-1,3,5-triazine];nereistoxin derivatives such as cartap, bensultap and thiocyclam;chlorinated hydrocarbon compounds such as benzoepin, dicofol andtetradifon; formamidine derivatives such as amitraz and chlordimeform;phenylpyrazole derivatives such as ethiprole; benzoylphenylureacompounds such as diflubenzuron, teflubenzuron, chlorfluazuron,flufenoxuron, triflumuron, hexaflumuron, lufenuron and novaluron;triazine derivatives such as cyromazine; thiadiazine derivatives such asbuprofezine; juvenoid compounds such as methoprene, hydroprene,fenoxycarb and diofenolan; tebufenozide; methoxyfenozide; halofenozide;chromafenozide; chlorofenapir; phenisobromolate; quinomethionate;propargit; fenbutatin oxide; hexythiazox; etoxazole; clofentezine;fenpyroximate; tebufenpyrad; pyrimidifen; polynactin complex;milbemectin; avermectin; ivermectin and azadirachtin.

EXAMPLES

The present invention will be further illustrated by the followingformulation examples and test example; however, the present invention isnot limited to these examples.

Formulation Example 1

Emulsifiable Concentrate

Fifteen parts of Compound A, 5 parts of Compound B, 8 parts ofpolyoxyethylenealkyl aryl ether, 2 parts of sodium alkylarylsulfonateand 70 parts of xylene are uniformly mixed to give an emulsifiableconcentrate.

Formulation Example 2

Wettable Powders

Ten parts of Compound A, 5 parts of Compound B, 3 parts of sodiumalkylbenzenesulfonate, 3 parts of sodium ligninsulfonate and 79 parts ofdiatomaceous earth are uniformly mixed and pulverized with a jet airmill to give wettable powders.

Formulation Example 3

Dusts

One part of Compound A, 3 parts of Compound B, 46 parts of talc and 50parts of clay are uniformly mixed and pulverized to give dusts.

Formulation Example 4

Flowable

Five parts of polyoxyethylene styryl phenyl ether sulfate, 20 parts of1% aqueous solution of xanthan gum, 3 parts of smectite mineral and 57parts of water are mixed, to which 5 parts of Compound A and 10 parts ofCompound B are added, and the resultant mixture is well stirred and thenwet pulverized in a sand mill to give a flowable.

Formulation Example 5

Microcapsule Formulation

Five parts of Compound A, 5 parts of Compound B, 10 parts ofphenylxylylethane and 0.5 part of Sumidur L-75 (toluenediisocyanateproduced by Sumika Bayer Urethane Co., Ltd.) are mixed, and theresultant mixture is then poured into 20 parts of 10% aqueous gum arabicsolution, followed by stirring in a homomixer to give an emulsion havingan average particle diameter of 20 μm. Two parts of ethylene glycol isadded to the emulsion and the reaction is allowed to proceed in a waterbath at 60° C. for 24 hours to give a microcapsule slurry. Separately,0.2 part of xanthan gum and 1.0 part of Veegum R (aluminum magnesiumsilicate produced by Sanyo Chemical Industries, Ltd.) are dispersed in56.3 parts of ion-exchanged water to give a thickner solution.

Finally, 42.5 parts of the above microcapsule slurry and 57.5 parts ofthe above thickner solution are mixed to give a 10% microcapsuleformulation.

Formulation Example 6

Oil Solution

One-tenth (0.1) part of Compound A and 0.5 part of Compound B aredissolved in a mixture of 5 parts of xylene and 5 parts oftrichloroethane, and the resultant solution is then mixed with 89.4parts of deodorized kerosene to give an oil solution.

Formulation Example 7

Poison Bait

Five milligrams (5 mg) of Compound A and 5 mg of Compound B aredissolved in 0.5 ml of acetone, and the resultant solution is thenuniformly mixed with 5 g of solid feed powder for animals (BreedingSolid Feed Powder CE-2 produced by Japan Clea Co., Ltd.). Air drying themixture to remove the acetone gives a poison bait.

Formulation Example 8

Resin Formulation

One part of Compound A and 1 part of Compound B are kneaded with 98parts of polyethylene resin (Sumikathene produced by Sumitomo ChemicalCo., Ltd.) in a pressure kneaer, followed by pelletizing. The pelletsare extruded at 160° C. to 180° C. with an inflation film making machineto give a film-shaped resin formulation with a thickness of 0.1 mm.

Formulation Example 9

Heating Smoke Formulation

Fifty milligrams (50 mg) of Compound A and 50 mg of Compound B aredissolved in a suitable amount of acetone. The resultant solution isthen absorbed in a porous ceramic plate with a size of 4.0 cm×4.0 cm and1.2 cm of thickness to give a heating smoke formulation.

The following test example show usefulness of the present compositionfor active ingredient of insecticidal/acaricidal composition.

Test Example 1

Insecticidal Test Against Silverleaf Whitefly (Bemisia argentifolii)

To each of an aqueous dilution in a designated concentration of anemulsifiable concentrate of Compound A (commercial name: Lano EC,manufactured by Sumitomo Chemical Co., Ltd.) and a flowable of CompoundB (commercial name: Sanmite flowable, manufactured by Nissan ChemicalIndustries, Ltd.), and a mixture of the emulsifiable concentrate ofCompound A in a designated concentration with the flowable of Compound Bin a designated concentration, a spreading agent (Shin-Rino,manufactured by Nihon Nohyaku Co., Ltd.) was added to make the amount ofthe spreading agent to {fraction (1/3000)} of volume to prepare a spraysolution.

Cabbage seedlings planted in 3 ounces plastic cup were placed in a netcage containing many living silverleaf whiteflies for 24 hours, so thatsilverleaf whiteflies became parasitic on the cabbage seedlings. Each ofthe above-prepared test solutions was sprayed with a spray gun. Thenumber of silverleaf whiteflies (i.e., the total number of adults andlarvae) surviving on the cabbage seedlings was examined just before andafter 9 days from the treatment. The test results are shown in table 1.

TABLE 1 Concentration of Number of Number of Active ingredients insectsbefore surviving insects Test Compound (ppm) treatment after 9 daysCompound A 50 59 30 Compound B 12.5 75 155 50 75 10 100 56 13 CompoundA + 50 + 12.5 84 6 Compound B 50 + 50   88 0 50 + 100  93 0 No treatment— 115 286Industrial Applicability

The pesticidal composition of the present invention has an excellentpesticidal efficacy.

1. A method for controlling pests which comprises applying a synergisticeffective amount of 4-phenoxyphenyl 2-(2-pyridyloxy)propyl ether and2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one topests or a place where the pest inhabits.
 2. A method for controllingpests according to claim 1, wherein the weight ratio of 4-phenoxyphenyl2-(2-pyridyloxy)propyl ether and2-tert-butyl-5-(4-tert-butylbenzyl-thio)-4-chloropyridazin-3(2H)-one isin the range of from 30:1 to 1:50.